CA3101179C - The nuclear reactor fuel assembly - Google Patents
The nuclear reactor fuel assembly Download PDFInfo
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- CA3101179C CA3101179C CA3101179A CA3101179A CA3101179C CA 3101179 C CA3101179 C CA 3101179C CA 3101179 A CA3101179 A CA 3101179A CA 3101179 A CA3101179 A CA 3101179A CA 3101179 C CA3101179 C CA 3101179C
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- Prior art keywords
- tube
- upper shell
- plate
- support element
- springs
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- 239000003758 nuclear fuel Substances 0.000 title claims abstract description 7
- 239000000446 fuel Substances 0.000 claims abstract description 28
- 125000006850 spacer group Chemical group 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910052770 Uranium Inorganic materials 0.000 description 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/3315—Upper nozzle
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/331—Comprising hold-down means, e.g. springs
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/20—Disposition of shock-absorbing devices ; Braking arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/3305—Lower nozzle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Vibration Prevention Devices (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
There is disclosed herein a nuclear reactor fuel assembly comprising a bundle of fuel rods installed in a frame formed by guide channels and spacer grids, a bottom nozzle, a removable head containing an upper shell, support element, springs, and collet elements. The upper shell of the removable head is made in the form of a tube with a rigidly fixed plate interacting with the springs. The collet elements are made of coaxially located lower tubes and upper tubes fixed in the plate. There are support platforms interacting with each other on the inner surface of the upper tubes and the outer surface of the lower tubes; the support element is made in the form of a tube coaxially located to the tube of the upper shell with the required assembly clearance.
Description
THE NUCLEAR REACTOR FUEL ASSEMBLY
Technical Field of the Invention The invention relates to nuclear engineering, more particularly, to fuel assemblies of nuclear pressurized water reactors.
Prior Art A nuclear reactor fuel assembly is known (a prototype, V.D. Shmelev, Yu.G.
Dragunov et al. Cores of VVER for Nuclear Power Plants, Moscow, IKC Akademkniga", 2004, p. 130 -131, Fig. 6.18 and 6.19), which comprises a bundle of fuel rods, installed in a frame formed by guide channels and spacing grids, a bottom nozzle, and a removable head. The removable head comprises the upper and lower shells, support hold-down plate, springs, collet tubes. The lower ends of the collet tubes are fixed to the guide channels, and the upper ones pass through holes in the hold-down plate and the upper shell's plate and have thrust bushings at the end. Thus, when the head is in operation, there may be a control rod in its upper shell.
The drawback of the known fuel assembly is that when a control rod falls, the support plate moves along 18 collet tubes, which are fixed to the guide channels on one side and in the holes of the upper shell's plate on the other one. To avoid jamming, it is necessary that the holes are accurately positioned for the passage of collet tubes in the support plate and the upper shell's plate. Also, this technical solution does not allow to reduce the height of the head in order to increase the fuel load without changing the dimensions of the fuel assembly. Another drawback of the known fuel assembly is that when the head which is fixed by collets on the guide channels is compressed, the collet tubes go up relative to the upper shell's plate. This requires choosing the height of the upper shell so that the collet does not interact with the elements of the control rod, which is a drawback, since it increases the height of the head, which negatively affects the uranium capacity of the fuel assembly.
{L2509606.1} 1 Date recue/date received 2022-05-02 Disclosure of the Invention The objective of the invention is to develop a design of a fuel assembly with the increased uranium capacity while maintaining end-to-end dimensions.
The object of the invention is to reduce the axial dimensions of the head of the fuel assembly, which allows increasing the height of the fuel column.
The technical result of the invention is the design change of the removable head enabling tightening of the fuel assembly, falling control rod energy dissipation with reduced axial dimensions of the removable head.
The invention's objective is achieved by the fact that the fuel assembly of a nuclear reactor comprises a bundle of fuel rods (1) installed in a frame formed by guide channels (2) and spacing grids (3), a bottom nozzle (4), a removable head (5) comprising an upper shell (6), a support element (7), springs (8), and collet tubes (17). The innovation lies in that the upper shell (6) of the removable head (5) is made in the form of a tube (9) with a rigidly fixed plate (10) interacting with the springs (8), with the collets (17) made of coaxi ally located lower tubes (18) and upper tubes (19) fixed in the place (10), the inner surface of the upper tubes (19) and the outer surface of the lower tubes (18) have base platforms (20) that interact with each other, the support element (7) is made in the form of a tube (11) coaxially located to the pipe (9) of the upper shell (6) with the necessary assembly clearance (12) and having a boss (13) in its lower part interacting with the springs (8), and a stop (14) interacting with the tube (9) of the upper shell(6); the plate (10) of the upper shell (6), opposite each of the bosses (13) of the support element (7) has holes (15), whose shape corresponds to the shape of the boss (13) of the support element (7), with the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) beoing at least the mounting clearance (12) between the tube (11) of the support element (7) and the tube (9) upper shell (6).
{L2509606.1} 2 Date recue/date received 2022-05-02 Brief Description of the Drawings The essence of the invention is explained by drawings, which are presented on:
Fig. 1 - nuclear reactor's fuel assembly;
Fig. 2 - vertical section of the removable head of the nuclear reactor fuel assembly, showing the position of the head elements when the regulator is deformed;
Fig. 4 - support element with the bosses;
Fig. 5 - upper shell's plate;
Fig. 6 - section of a collet tube made of the upper tube and the lower tube.
Embodiment of the Invention The fuel assembly of a nuclear reactor comprises a bundle of fuel rods (1) installed in a frame formed by guiding channels (2) and spacing grids (3), a bottom nozzle (4), a removable head (5) comprising an upper mantle (6), a support element (7), springs (8), and collet tubes (17). The collet element (17) is made of coaxially located lower tube (18) and upper tube (19) rigidly fixed in the plate (16), the upper shell (6), while on the inner surface of the tube (19) and on the outer surface of the lower tube (18) there are base platforms (20) which interact with each other. The upper shell (6) of the removable head (5) is made in the form of a tube (9) with fixed plate (10) interacting with springs (8), support element (7) made in the form of a tube (11) located coaxially to the tube (9) of the upper shell (6) with a required installing clearance (12) and having bosses (13) in the lower part interacting with springs (8), and at the upper part the stop (14) interacting with the tube (9) of the upper shell (6), and in the plate (10) of the upper shell (6) opposite each of the bosses (13) of the support element (7) there are holes (15) which conform to the shape of the boss (13) of the support element (7), wherein the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) is at least the installing clearance (12) between the tube (11) of the support element (7) and the tube (9) of the upper shell (6).
{L2509606.1} 3 Date recue/date received 2022-05-02 The operation of the nuclear reactor fuel assembly is carried out as follows.
Collet elements (17) are split-type, consisting of an upper (19) and a lower (18) tube with support platforms (20) on the inner surface of the tube (19) and the outer surface of the lower tube (19). Thus, the upper tube (19) of the collet element (17) is rigidly connected (for example, by welding) to the plate (10) of the upper shell (6) of the head.
Springs with initial pre-tightening are installed coaxially to the collet elements (17) and create a force on the upper (19) and lower (18) tubes of the collet elements (17). Due to this force when the head is not tightened the upper (19) and lower (18) tubes of the collet element (17) are pressed against each other by the base platforms (20) made in them.
The relative location of these base platforms (20) and the sizes of the upper (19) and lower (18) tubes taking into account a rigid connection of the upper tube (19) with the plate (16) and the upper shell (6) of the head determines the maximum distance between the plates of the upper and lower shells and therefore, the overall vertical dimension of the unloaded head of the fuel assembly (not shown in the drawing) and a pre-tightening of the head's spring unit.
Portion of springs (8) of the removable head (5) of a nuclear reactor's fuel assembly thrusts their upper ends against the plate (10) of the upper mantle (6), rigidly connected to the upper shell (6). The other portion of the springs (8) thrusts its upper ends against the bosses (13) of the support element (7).The fuel assembly with the removable head (5) installed in a nuclear reactor is pre-tightened by the internals of the nuclear reactor (not shown in the figure).
When tightening the head of the fuel assembly, the upper shell (6) of the head moves down together with the support element (7), the tube (9) with the plate (10) rigidly fixed in it, and the upper tubes (19) of collet elements connected to the plate (10), which move along the lower collet tubes (18), wherein a clearance is formed between the stop (20) of the upper tube (19) and the stop (20) of the lower collet tube (18). The springs rest against the plate (10) or against the bosses (13) of the support element (7) with their upper end, and against the lower {L2509606.1} 4 Date recue/date received 2022-05-02 projections of the lower tubes (18) of the collet elements (17) with their lower end through special bushings. Each guide channel (2) goes inside the corresponding lower tube (18) of the collet element (17). Tightening the head of the fuel assembly causes reduction of the distance between the plate (10) and the upper ends of the guide channels which support the lower collet tubes (18) and, consequently, there are additional (beyond preliminary one) compression of the springs of the spring unit and higher tightening forces of individual guide channels. When tightening the head (5) of fuel assembly, the support element (7) together with the tube (9) and the plate (10) moves down compressing all the springs (8) of the spring unit of the fuel assembly. The force generated by the springs (8) ensures that the fuel assembly does not float in all the operating modes.
When the emergency protection actuates, the structural elements of the control rod (16) interact with the plate (10). The control rod (16) falling energy is absorbed by springs interacting directly with the plate (10) of the upper shell (6). The tube (9), plate (10) and the upper tubes (19) of the collet element (17) are moved; the springs are compressed adding to the load through the lower collet tubes (18) and the guide channels (2) in the same way as when the fuel assembly is tightened. When the emergency protection actuates, the structural elements of the control rod (16) interact with the plate (10) rigidly fixed in the tube (9) of the upper shell (6) pressing it down. The control rod (16) falling energy is absorbed by springs (8) interacting directly with the plate (10) of the upper shell (6). Wherein the springs (8) resting on the bosses (13) of the support element (7) remain stationary due to the cutouts in the plate (10) of the upper shell (6) into whichthe bosses (13) of the support element (7) enter.
Thus, this ensures that a nuclear reactor's fuel assembly is fixed in the plate of the reactor's protective tube unit when the emergency protection is triggered.
{L2509606.1} 5 Date recue/date received 2022-05-02 Industrial Applicability The proposed solution is most appropriate to be used for operation in water cooled water moderated nuclear power reactors.
{L2509606.1} 6 Date recue/date received 2022-05-02
Technical Field of the Invention The invention relates to nuclear engineering, more particularly, to fuel assemblies of nuclear pressurized water reactors.
Prior Art A nuclear reactor fuel assembly is known (a prototype, V.D. Shmelev, Yu.G.
Dragunov et al. Cores of VVER for Nuclear Power Plants, Moscow, IKC Akademkniga", 2004, p. 130 -131, Fig. 6.18 and 6.19), which comprises a bundle of fuel rods, installed in a frame formed by guide channels and spacing grids, a bottom nozzle, and a removable head. The removable head comprises the upper and lower shells, support hold-down plate, springs, collet tubes. The lower ends of the collet tubes are fixed to the guide channels, and the upper ones pass through holes in the hold-down plate and the upper shell's plate and have thrust bushings at the end. Thus, when the head is in operation, there may be a control rod in its upper shell.
The drawback of the known fuel assembly is that when a control rod falls, the support plate moves along 18 collet tubes, which are fixed to the guide channels on one side and in the holes of the upper shell's plate on the other one. To avoid jamming, it is necessary that the holes are accurately positioned for the passage of collet tubes in the support plate and the upper shell's plate. Also, this technical solution does not allow to reduce the height of the head in order to increase the fuel load without changing the dimensions of the fuel assembly. Another drawback of the known fuel assembly is that when the head which is fixed by collets on the guide channels is compressed, the collet tubes go up relative to the upper shell's plate. This requires choosing the height of the upper shell so that the collet does not interact with the elements of the control rod, which is a drawback, since it increases the height of the head, which negatively affects the uranium capacity of the fuel assembly.
{L2509606.1} 1 Date recue/date received 2022-05-02 Disclosure of the Invention The objective of the invention is to develop a design of a fuel assembly with the increased uranium capacity while maintaining end-to-end dimensions.
The object of the invention is to reduce the axial dimensions of the head of the fuel assembly, which allows increasing the height of the fuel column.
The technical result of the invention is the design change of the removable head enabling tightening of the fuel assembly, falling control rod energy dissipation with reduced axial dimensions of the removable head.
The invention's objective is achieved by the fact that the fuel assembly of a nuclear reactor comprises a bundle of fuel rods (1) installed in a frame formed by guide channels (2) and spacing grids (3), a bottom nozzle (4), a removable head (5) comprising an upper shell (6), a support element (7), springs (8), and collet tubes (17). The innovation lies in that the upper shell (6) of the removable head (5) is made in the form of a tube (9) with a rigidly fixed plate (10) interacting with the springs (8), with the collets (17) made of coaxi ally located lower tubes (18) and upper tubes (19) fixed in the place (10), the inner surface of the upper tubes (19) and the outer surface of the lower tubes (18) have base platforms (20) that interact with each other, the support element (7) is made in the form of a tube (11) coaxially located to the pipe (9) of the upper shell (6) with the necessary assembly clearance (12) and having a boss (13) in its lower part interacting with the springs (8), and a stop (14) interacting with the tube (9) of the upper shell(6); the plate (10) of the upper shell (6), opposite each of the bosses (13) of the support element (7) has holes (15), whose shape corresponds to the shape of the boss (13) of the support element (7), with the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) beoing at least the mounting clearance (12) between the tube (11) of the support element (7) and the tube (9) upper shell (6).
{L2509606.1} 2 Date recue/date received 2022-05-02 Brief Description of the Drawings The essence of the invention is explained by drawings, which are presented on:
Fig. 1 - nuclear reactor's fuel assembly;
Fig. 2 - vertical section of the removable head of the nuclear reactor fuel assembly, showing the position of the head elements when the regulator is deformed;
Fig. 4 - support element with the bosses;
Fig. 5 - upper shell's plate;
Fig. 6 - section of a collet tube made of the upper tube and the lower tube.
Embodiment of the Invention The fuel assembly of a nuclear reactor comprises a bundle of fuel rods (1) installed in a frame formed by guiding channels (2) and spacing grids (3), a bottom nozzle (4), a removable head (5) comprising an upper mantle (6), a support element (7), springs (8), and collet tubes (17). The collet element (17) is made of coaxially located lower tube (18) and upper tube (19) rigidly fixed in the plate (16), the upper shell (6), while on the inner surface of the tube (19) and on the outer surface of the lower tube (18) there are base platforms (20) which interact with each other. The upper shell (6) of the removable head (5) is made in the form of a tube (9) with fixed plate (10) interacting with springs (8), support element (7) made in the form of a tube (11) located coaxially to the tube (9) of the upper shell (6) with a required installing clearance (12) and having bosses (13) in the lower part interacting with springs (8), and at the upper part the stop (14) interacting with the tube (9) of the upper shell (6), and in the plate (10) of the upper shell (6) opposite each of the bosses (13) of the support element (7) there are holes (15) which conform to the shape of the boss (13) of the support element (7), wherein the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) is at least the installing clearance (12) between the tube (11) of the support element (7) and the tube (9) of the upper shell (6).
{L2509606.1} 3 Date recue/date received 2022-05-02 The operation of the nuclear reactor fuel assembly is carried out as follows.
Collet elements (17) are split-type, consisting of an upper (19) and a lower (18) tube with support platforms (20) on the inner surface of the tube (19) and the outer surface of the lower tube (19). Thus, the upper tube (19) of the collet element (17) is rigidly connected (for example, by welding) to the plate (10) of the upper shell (6) of the head.
Springs with initial pre-tightening are installed coaxially to the collet elements (17) and create a force on the upper (19) and lower (18) tubes of the collet elements (17). Due to this force when the head is not tightened the upper (19) and lower (18) tubes of the collet element (17) are pressed against each other by the base platforms (20) made in them.
The relative location of these base platforms (20) and the sizes of the upper (19) and lower (18) tubes taking into account a rigid connection of the upper tube (19) with the plate (16) and the upper shell (6) of the head determines the maximum distance between the plates of the upper and lower shells and therefore, the overall vertical dimension of the unloaded head of the fuel assembly (not shown in the drawing) and a pre-tightening of the head's spring unit.
Portion of springs (8) of the removable head (5) of a nuclear reactor's fuel assembly thrusts their upper ends against the plate (10) of the upper mantle (6), rigidly connected to the upper shell (6). The other portion of the springs (8) thrusts its upper ends against the bosses (13) of the support element (7).The fuel assembly with the removable head (5) installed in a nuclear reactor is pre-tightened by the internals of the nuclear reactor (not shown in the figure).
When tightening the head of the fuel assembly, the upper shell (6) of the head moves down together with the support element (7), the tube (9) with the plate (10) rigidly fixed in it, and the upper tubes (19) of collet elements connected to the plate (10), which move along the lower collet tubes (18), wherein a clearance is formed between the stop (20) of the upper tube (19) and the stop (20) of the lower collet tube (18). The springs rest against the plate (10) or against the bosses (13) of the support element (7) with their upper end, and against the lower {L2509606.1} 4 Date recue/date received 2022-05-02 projections of the lower tubes (18) of the collet elements (17) with their lower end through special bushings. Each guide channel (2) goes inside the corresponding lower tube (18) of the collet element (17). Tightening the head of the fuel assembly causes reduction of the distance between the plate (10) and the upper ends of the guide channels which support the lower collet tubes (18) and, consequently, there are additional (beyond preliminary one) compression of the springs of the spring unit and higher tightening forces of individual guide channels. When tightening the head (5) of fuel assembly, the support element (7) together with the tube (9) and the plate (10) moves down compressing all the springs (8) of the spring unit of the fuel assembly. The force generated by the springs (8) ensures that the fuel assembly does not float in all the operating modes.
When the emergency protection actuates, the structural elements of the control rod (16) interact with the plate (10). The control rod (16) falling energy is absorbed by springs interacting directly with the plate (10) of the upper shell (6). The tube (9), plate (10) and the upper tubes (19) of the collet element (17) are moved; the springs are compressed adding to the load through the lower collet tubes (18) and the guide channels (2) in the same way as when the fuel assembly is tightened. When the emergency protection actuates, the structural elements of the control rod (16) interact with the plate (10) rigidly fixed in the tube (9) of the upper shell (6) pressing it down. The control rod (16) falling energy is absorbed by springs (8) interacting directly with the plate (10) of the upper shell (6). Wherein the springs (8) resting on the bosses (13) of the support element (7) remain stationary due to the cutouts in the plate (10) of the upper shell (6) into whichthe bosses (13) of the support element (7) enter.
Thus, this ensures that a nuclear reactor's fuel assembly is fixed in the plate of the reactor's protective tube unit when the emergency protection is triggered.
{L2509606.1} 5 Date recue/date received 2022-05-02 Industrial Applicability The proposed solution is most appropriate to be used for operation in water cooled water moderated nuclear power reactors.
{L2509606.1} 6 Date recue/date received 2022-05-02
Claims
1. A nuclear reactor fuel assembly comprising:
a bundle of fuel rods (1) installed in a frame fonned by guide channels (2) and spacer grids (3);
a bottom nozzle (4); and a removable head (5) containing:
an upper shell (6);
a support element (7);
springs (8); and collet elements (17);
characterized in that the upper shell (6) of the removable head (5) is made in the fonn of a tube (9) with a rigidly fixed plate (10) interacting with the springs (8);
wherein:
the collet elements (17) are made of coaxially located lower tubes (18) and upper tubes (19) fixed in the plate (10);
the upper tube (19) on its inner surface and the lower tube (18) on its outer surface have support platforms interacting with each other;
the support element (7) is made in the form of a tube (11) coaxially located to the tube (9) of the upper shell (6) with a clearance (12), the tube (11) has bosses (13) in its lower part interacting with the springs (8), and a stop (14) is made in the upper part of the tube (11) interacting with the tube (9) of the upper shell (6);
wherein the plate (10) of the upper shell (6), opposite each boss (13) of the support element (7), has holes (15) whose shape corresponds to the shape of the boss (13) of the support element (7), with the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) being at least the clearance (12) between the tube (11) of the support element (7) and the tube (9) of the upper shell (6).
Date recue/Date received 2023-03-29
a bundle of fuel rods (1) installed in a frame fonned by guide channels (2) and spacer grids (3);
a bottom nozzle (4); and a removable head (5) containing:
an upper shell (6);
a support element (7);
springs (8); and collet elements (17);
characterized in that the upper shell (6) of the removable head (5) is made in the fonn of a tube (9) with a rigidly fixed plate (10) interacting with the springs (8);
wherein:
the collet elements (17) are made of coaxially located lower tubes (18) and upper tubes (19) fixed in the plate (10);
the upper tube (19) on its inner surface and the lower tube (18) on its outer surface have support platforms interacting with each other;
the support element (7) is made in the form of a tube (11) coaxially located to the tube (9) of the upper shell (6) with a clearance (12), the tube (11) has bosses (13) in its lower part interacting with the springs (8), and a stop (14) is made in the upper part of the tube (11) interacting with the tube (9) of the upper shell (6);
wherein the plate (10) of the upper shell (6), opposite each boss (13) of the support element (7), has holes (15) whose shape corresponds to the shape of the boss (13) of the support element (7), with the clearance in plan view between the hole (15) in the plate (10) of the upper shell (6) and the boss (13) being at least the clearance (12) between the tube (11) of the support element (7) and the tube (9) of the upper shell (6).
Date recue/Date received 2023-03-29
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2018130533A RU2686662C1 (en) | 2018-08-23 | 2018-08-23 | Nuclear reactor fuel assembly |
| RU2018130533 | 2018-08-23 | ||
| PCT/RU2018/000912 WO2020040657A1 (en) | 2018-08-23 | 2018-12-29 | Nuclear reactor fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3101179A1 CA3101179A1 (en) | 2020-02-27 |
| CA3101179C true CA3101179C (en) | 2024-02-27 |
Family
ID=66430429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3101179A Active CA3101179C (en) | 2018-08-23 | 2018-12-29 | The nuclear reactor fuel assembly |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US11476009B2 (en) |
| EP (1) | EP3842739A4 (en) |
| JP (1) | JP7072679B2 (en) |
| KR (1) | KR102482187B1 (en) |
| CN (1) | CN112243486B (en) |
| BR (1) | BR112020024995B1 (en) |
| CA (1) | CA3101179C (en) |
| EA (1) | EA202092705A1 (en) |
| JO (1) | JOP20200310A1 (en) |
| RU (1) | RU2686662C1 (en) |
| WO (1) | WO2020040657A1 (en) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1283195A (en) * | 1969-04-17 | 1972-07-26 | British Nuclear Design Constr | Fuel element assemblies for fluid-cooled nuclear reactors |
| US4208248A (en) * | 1977-10-26 | 1980-06-17 | The Babcock & Wilcox Company | Fuel assembly with a removable end fitting |
| FR2522866B1 (en) * | 1982-03-04 | 1987-12-31 | Commissariat Energie Atomique | NUCLEAR REACTOR FUEL ASSEMBLY |
| US4702882A (en) * | 1985-04-04 | 1987-10-27 | Westinghouse Electric Corp. | Quick disconnect top nozzle for a nuclear fuel assembly |
| FR2641118B1 (en) * | 1988-12-28 | 1992-10-16 | Framatome Sa | |
| RU2079171C1 (en) * | 1995-07-20 | 1997-05-10 | Опытное Конструкторское Бюро "Гидропресс" | Nuclear reactor fuel assembly |
| DE19532366C1 (en) * | 1995-09-01 | 1996-12-05 | Siemens Ag | Plant inerting and venting containment atmosphere of nuclear reactor |
| RU2212065C2 (en) * | 2001-10-09 | 2003-09-10 | Опытное Конструкторское Бюро "Гидропресс" | Removable top nozzle of nuclear-reactor fuel assembly (alternatives) |
| RU2248051C1 (en) * | 2003-06-23 | 2005-03-10 | Фгуп Окб "Гидропресс" | Nuclear reactor fuel assembly |
| JP4181078B2 (en) | 2004-03-24 | 2008-11-12 | 株式会社日本触媒 | Air purifier |
| RU2325715C2 (en) * | 2006-05-29 | 2008-05-27 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Removable head of nuclear reactor fuel assembly |
| CA2710432C (en) * | 2007-12-26 | 2016-04-26 | Thorium Power, Inc. | Nuclear reactor, fuel assembly consisting of driver-breeding modules for a nuclear reactor and a fuel cell for a fuel assembly |
| CN101971266A (en) * | 2008-04-23 | 2011-02-09 | 机械工程制造厂股份公司 | Fuel assembly for a nuclear reactor |
| RU2419899C1 (en) * | 2010-05-12 | 2011-05-27 | Открытое акционерное общество "Ордена Трудового Красного Знамени и ордена труда ЧССР опытное конструкторское бюро "Гидропресс" | Fuel assembly of nuclear reactor |
| RU2551432C1 (en) * | 2013-11-19 | 2015-05-27 | Открытое Акционерное Общество "Акмэ-Инжиниринг" | Fuel element jacket, fuel element and fuel assembly |
| CN204407018U (en) * | 2014-12-05 | 2015-06-17 | 上海核工程研究设计院 | The syndeton of a kind of removable upper base and guide pipe |
| WO2019240610A1 (en) * | 2018-06-15 | 2019-12-19 | Акционерное Общество "Твэл" | Nuclear reactor fuel assembly |
-
2018
- 2018-08-23 RU RU2018130533A patent/RU2686662C1/en active
- 2018-12-29 EP EP18930861.2A patent/EP3842739A4/en active Pending
- 2018-12-29 US US17/256,554 patent/US11476009B2/en active Active
- 2018-12-29 CN CN201880093736.4A patent/CN112243486B/en active Active
- 2018-12-29 CA CA3101179A patent/CA3101179C/en active Active
- 2018-12-29 EA EA202092705A patent/EA202092705A1/en unknown
- 2018-12-29 WO PCT/RU2018/000912 patent/WO2020040657A1/en active Application Filing
- 2018-12-29 JO JOP/2020/0310A patent/JOP20200310A1/en unknown
- 2018-12-29 JP JP2020565917A patent/JP7072679B2/en active Active
- 2018-12-29 KR KR1020207035879A patent/KR102482187B1/en active IP Right Grant
- 2018-12-29 BR BR112020024995-5A patent/BR112020024995B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| RU2686662C1 (en) | 2019-04-30 |
| KR102482187B1 (en) | 2022-12-29 |
| BR112020024995A2 (en) | 2021-03-23 |
| EA202092705A1 (en) | 2021-06-07 |
| CN112243486A (en) | 2021-01-19 |
| BR112020024995B1 (en) | 2023-09-26 |
| CN112243486B (en) | 2022-07-12 |
| KR20210008859A (en) | 2021-01-25 |
| US20210366623A1 (en) | 2021-11-25 |
| WO2020040657A1 (en) | 2020-02-27 |
| JOP20200310A1 (en) | 2020-11-30 |
| US11476009B2 (en) | 2022-10-18 |
| CA3101179A1 (en) | 2020-02-27 |
| JP7072679B2 (en) | 2022-05-20 |
| JP2021531451A (en) | 2021-11-18 |
| EP3842739A4 (en) | 2022-08-03 |
| EP3842739A1 (en) | 2021-06-30 |
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